为什么引入xsd文件的时候，eclipse会报错？

<?xml version="1.0" encoding="UTF-8"?>
<!-- 教学计划 -->
<teaching-plan xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="planSchema.xsd">
    <!-- 课程 -->
    <course no="001">
        <!-- 课程名 -->
        <course-name>大学英语</course-name><course-name>大学英语</course-name>
        <!-- 课时 -->
        <class-hour>36</class-hour>
        <!-- 考核方式 -->
        <exam-form>考试</exam-form>
    </course>
        <!-- 课程 -->
    <course no="002">
        <!-- 课程名 -->
        <course-name>高等数学</course-name>
        <!-- 课时 -->
        <class-hour>70</class-hour>
        <!-- 考核方式 -->
        <exam-form>考试</exam-form>
    </course>
        <!-- 课程 -->
    <course no="003">
        <!-- 课程名 -->
        <course-name>计算机应用基础</course-name>
        <!-- 课时 -->
        <class-hour>108</class-hour>
        <!-- 考核方式 -->
        <exam-form>上机考试</exam-form>
    </course>
</teaching-plan>

<?xml version="1.0" encoding="UTF-8"?>
<schema xmlns="http://www.w3.org/2001/XMLSchema">
    <complexType name="name1">
        <sequence>
            <element name="course" minOccurs="1" maxOccurs="100">
                <complexType>
                    <sequence>
                        <element name="course-name" type="string"></element>
                        <element name="class-hour">
                            <simpleType>
                                <restriction base="integer">
                                    <minInclusive value="20"></minInclusive>
                                    <maxInclusive value="110"></maxInclusive>
                                </restriction>
                            </simpleType>
                        </element>
                        <element name="exam-form" type="string"></element>
                    </sequence>
                    <attribute name="id" type="string" use="required"></attribute>
                </complexType>
            </element>
        </sequence>
    </complexType>    
</schema>